<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>web site</title>
	</head>
	<body>
		<script type="text/javascript">
			
		
			// fn(1,1);
			// fn(1,1,1);
			fn();
			
			function fn(a,b){
				alert(a+b);
				alert(a);
				alert(b);
				document.getElementById(a).title = "nihao";
			}
			function fn(a,b,c){
				alert(a,b,c);
			}
		</script>
	</body>
</html>